Price Paid:
$300.00
at bikeshop Favorite Ride: French cols Bike Setup: OCLV carbon Trek, Ultegra 6600 group, Mavic ES wheels. Summary: This review is for the first generation power sensor kit which is compatible with the S series heart monitor watch's:
For the money you cannot expect this unit to be perfect..or even as good as an SRM/PT ect. But its consistantly accurate which is the most important thing. It does have issues with accuracy in the higher gear spectrum, but cruising on flats rollers and climbing on long hard terrain on low gears (alpine) it excels and matches the others. No swapping wheels (PT) or cranks (SRM) or numerous hubs needed (PT), and draughting not affected (ibike). It does have its problems though. pretty crappy/weak/clunky/fragile derailleur region, its been back to Polar numerous times and fixed..even replaced fully, but for where I want to measure power the benefits outweigh the negatives overall.
If I had more money (to buy another shed load of wheels and a PT, or an SRM I would) but untill then this will do fine.
Strengths: -consistent accuracy (upon proper installation)
-great for capturing low gear efforts on long climbs.
-'cheap' modular add on to HRM 4 power!
Weaknesses: -Fragile system
-peak power way low (1/2 SRM)
-high gears big ring issues w/ accuracy
-clunky design
-wires prone to snag and break if not carefull installation.
-not idiot proof!..not 4 all you joes out there.. Similar Products Used: none 
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